PNET (Polish Named Entity Triggers) is an electronic lexicon containing partly inflected external or internal evidences, or trigger words, for Polish named entities (NEs). A NE trigger is a word or a list of words which appears frequently in the vicinity or inside named entities and is a good indicator of these NEs' types. For instance "aktor" ('actor') is an external evidence for person names (as in "aktor [Zbigniew Buczkowski]"), while "von" is an internal evidence for the same type ("[John von Neumann]"). Many words can be both external and internal evidences, e.g. "jezioro" ('lake') is a external evidence in "jezioro [Mamry]" ('[Mamry] lake') and an internal evidence in "Jezioro Białe" ('[White Lake]'). External and internal NE evidences can be used in automatic NE recognition via grammar-based or machine-learning methods.